Sacking into valve bags



Jan. 4, 1938. A. DU- BOIS 2,104,154

' SACKING INTO VALVE BAGS Filed Feb. 6, 1956 Patented Jan. 4, 1938 PATENT OFFICE SAGKING INTO VALVE BAGS Alfred Du Bois, Paris, France Application February 6, 1936, Serial No. 62,561 In France February 15, 1935 7 Claims.

My invention relates to improvements in and relating to the sacking into valve bags. It is a known fact that valve bags are filled by means of a spout which is inserted through the valve. Heretofore, the valve is opened by hand in order to provide for the insertion of the spout, which latter gives a rounded form to the valve, and thus upon withdrawing the spout when the bag is filled, the valve retains this rounded form after the removal of the spout until an external force, such as the weight of the material contained in the bag shall act to flatten the valve, during the tipping of the bag for instance. This flattening takes place in a more or less perfect way and the large valves, in particular, are very imperfectly closed.

My invention essentially provides a new filling spout so designed or so shaped externally that when it has been inserted into a valve bag through the valve, it will be capable of exerting upon the valve such an action that the valve will be compelled to assume the flat form which it should have when closed, the said valve keeping this form after removal of the tube.

By the use of such a spout, it now becomes possible to provide valves of very large cross section which however will close in the most accurate manner.

In the case of a spout with unchangeable shape, the cross section of the spout varies along the spout, proceeding for instance from a substantially circular section to a substantially oval section becoming more and more flattened towards the delivery end of the spout. It will readily be understood that by withdrawing the spout, the valve will be subjected to a progressive deformation and it will be entirely flattened when the end of the spout leaves the valve.-

It is obvious that the length of the periphery of the spout will be preferably equal to the length of the periphery of the valve, and in the case of a spout with unchangeable shape, it is advantageous that this length of the periphery of the spout shall remain constant at any point of the spout, in spite of the progressive variation of the shape of the spout cross-section.

0n the other hand, the action of such a spout is not limited to the flattening of the valve. The inverse action takes place when the spout is inserted into the valve, and this facilitates the insertion of the spout, especially when the bag is full. In consequence, and this is another feature of the invention, such a spout can be readily employed for the emptying of a valve'bag which eliminates the necessity of tearing the bag and permits it to be used again, more particularly in the case of the accompanying drawing represents solely by 5 way of example which is not of a limitative nature, a particular embodiment of a spout'according to my invention.

Fig. 1 is a partial elevational view of a spout with unchangeable external shape and progressively varying cross-section.

Fig. 2 is a bottom plan view of the same.

Fig. 3 is similar to Fig. 2 but shows the progressive variation of the spout section, and

Fig. 4 is an end view.

Fig. 5 illustrates an independent filling spout not forming part of a filling machine.

In this embodiment, the spout which comprises for example a cylindrical part I having a diameter d ends in a part 2 which spreads out gradually in plan view (Fig. 2) while it diminishes in height (Fig. 1) and becomes substantially flat at the end the width of which is Z. The said spout is preferably constructed in such way that 2 Z=1rd if the spout is entirely flat at the end, or if it still remains slightly convex, the sum of the length of the arc and the length of the chord of this are will be 1rd. It is further advantageous that the aforesaid condition will be satisfied by the outline of any section of this evolutive part 2 of the spout.

On the other hand, it is preferable, as shown in Fig. 2, that the spout should be terminated by a practically straight or slightly curved edge, this form affording some advantage with certain types of bags.

To facilitate its engagement in the valve, the spout may be terminated by a part 3 of short length, whose width diminishes at the same time that it is downwardly inclined.

Ports for the projection of. an adhesive substance are provided at 4, and herein such ports consist in holes formed in the upper wall of a small receptacle which is provided upon the whole width of the upper side of the spout at its end, and in this case, on the flat part 3, and they form a transverse row. A small pipe 6 running along the spout leads into the receptacle 5 and. serves to connect the latter to a device, not shown, for the feeding of the adhesive substance.

It is evident that the said ports may be em- 0 ployed in a greater or less number corresponding to the width of the valve, and they may eventually form a plurality of rows.

Owing to these ports, it is possible, by automatic means or by hand, to supply an adhesive 55 A spout in conformity with the invention may form part of a sacking machine of any known type or it may be independent (Fig. 5); in the latter case, it can be used with equal facility for the filling and the emptying of the bag and it thus constitutes a real new article of manufacture.

The said spout may be manufactured by any known process although it will be advantageous to manufacture it by casting.

What I claim is: r

1. For filling valve bags a filling spout the cross-section of which progressively varies along the spout and gets both enlarged andflattened towards the delivery end where it is substantially flat so that the flattening of the valve takes place by the withdrawal of the said spout from the valve. 7

2. For filling valve bags a filling spout as in.

claim 1 wherein further the length of the peripheral outline of any cross-section of the evolutive part of the spout is substantially the same.

3. For filling valve bags a filling spout as in claim 1 comprising further at its delivery end an end part of short length whose width gets smaller towards the extreme edge of the spout and is somewhat inclined towards the spout axis.

4. For filling valve bagsa filling spout as in claim 1 comprising further at its delivery end an end part of short length'whose width gets smaller towards the extreme edge of the spout and somewhat inclined towards the spout axis, ports provided on said inclined end part for the projection of an adhesive material and at least one duct running along the spout to supply said ports with adhesive material.

5. For filling valve bags a filling spout as in claim 1 wherein further the spout is terminated at its delivery end by a substantially straight edge. 7

6. For filling valve'bags a filling spout as in claim 1 wherein further the spout is terminated at its delivery end by a slightly curved edge.

' 7. For filling and emptying a valve bag a spout as in claim 1 forming an independent and portable unit.

ALFRED DU B013. 

